TY - GEN A1 - Ewert, Uwe A1 - Beckmann, Jörg A1 - Bellon, Carsten A1 - Jaenisch, Gerd-Rüdiger A1 - Zscherpel, Uwe A1 - Jechow, Mirko A1 - Großer, A. T1 - Fehlergrößenabhängige Kontrastreduktion und zusätzliche Unschärfe durch Streustrahlung reduzierendie Bildqualität radiologischer Abbildungen - Film und digitale Detektoren im Vergleich T2 - DACH-Jahrestagung 2008 - Zerstörungsfreie Materialprüfung, ZfP in Forschung, Entwicklung und Anwendung CY - St. Gallen, Schweiz DA - 2008-04-28 KW - Digitale Radiologie KW - Streuverhältnis KW - Strahlenkontrast KW - Unschärfe PY - 2008 SN - 978-3-940283-09-2 IS - DGZfP-BB 113 (Di.1.A.1) SP - 133 EP - 144 AN - OPUS4-18349 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Vengrinovich, V. A1 - Denkevich, Y. A1 - Zolotarev, S. A1 - Jaenisch, Gerd-Rüdiger A1 - Zscherpel, Uwe T1 - Tomographic reconstruction and wall thickness measurement with special attention to scattered radiation for in-service inspection of pipes KW - Nondestructive evaluation KW - Tomography KW - X-rays PY - 2005 SN - 0934-9847 SN - 1432-2110 VL - 16 IS - 1 SP - 15 EP - 34 PB - Taylor & Francis CY - Philadelphia, Pa. AN - OPUS4-11884 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Ewert, Uwe A1 - Jaenisch, Gerd-Rüdiger A1 - Osterloh, Kurt A1 - Zscherpel, Uwe ED - Czichos, Horst ED - Tetsuya Saito, ED - Leslie Smith, T1 - Industrial Radiology KW - Fundamentals KW - Particle-Based Radiological Methods KW - Film Radiography KW - Digital Radiological Methods KW - Public Safety and Security PY - 2006 SN - 978-3-540-20785-6 SP - 844 EP - 858 PB - Springer CY - Berlin AN - OPUS4-14473 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gollwitzer, Christian A1 - Bellon, Carsten A1 - Deresch, Andreas A1 - Ewert, Uwe A1 - Jaenisch, Gerd-Rüdiger A1 - Zscherpel, Uwe A1 - Mistral, Q. ED - Thompson, D. O. ED - Chimenti, D. E. T1 - Simulation supported POD for RT test case - concept and modeling N2 - Within the framework of the European project PICASSO, the radiographic simulator aRTist (analytical Radiographic Testing inspection simulation tool) developed by BAM has been extended for reliability assessment of film and digital radiography. NDT of safety relevant components of aerospace industry requires the proof of probability of detection (POD) of the inspection. Modeling tools can reduce the expense of such extended, time consuming NDT trials, if the result of simulation fits to the experiment. Our analytic simulation tool consists of three modules for the description of the radiation source, the interaction of radiation with test pieces and flaws, and the detection process with special focus on film and digital industrial radiography. It features high processing speed with near–interactive frame rates and a high level of realism. A concept has been developed as well as a software extension for reliability investigations, completed by a user interface for planning automatic simulations with varying parameters and defects. Furthermore, an automatic image analysis procedure is included to evaluate the defect visibility. The radiographic modeling from 3D CAD of aero engine components and quality test samples are compared as a precondition for real trials. This enables the evaluation and optimization of film replacement for application of modern digital equipment for economical NDT and defined POD. T2 - 38th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Burlington, VT, USA DA - 2011-07-17 KW - X-ray imaging KW - Probability of detection KW - Simulation KW - ZfP KW - Radiographie KW - POD PY - 2012 SN - 978-0-7354-1013-8 DO - https://doi.org/10.1063/1.4716283 SN - 0743-0760 SN - 0094-243X N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings VL - 31 IS - 1430 SP - 605 EP - 612 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-26696 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Müller, Christina A1 - Zscherpel, Uwe A1 - Ewert, Uwe A1 - Rosenthal, Martina A1 - Bellon, Carsten A1 - Jaenisch, Gerd-Rüdiger ED - Madalgue, X. P. V. T1 - Reliability investigation of NDE signals N2 - The reliability investigations are dedicated to throw light on the performance of the NDE system with respect to the required aim. This is especially of interest when digitized and processed signals are involved where it becomes hard to assess whether the quality of the system has raised or not. Three different ways to investigate reliability of NDE signals will be described. The first way of investigation, the performance demonstration, is preferred e.g. in the US American nuclear power industry. This is an integral consideration of the non destructive test as a system where the whole NDE system is packed in a black box and only the input in terms of the real existing flaws in the component is considered and compared to the output in terms of the indications of the human inspector or of the automated system. The second – the European tradition – relies on a standardized description of physical/technical parameters of the NDE system which are preconditions for successful system performance. An example for such a standardized set of performance parameters is given in the recently released standard about Xray film digitization CEN EN 14096. The third approach – the modular conception – is a marriage of both: The signal chain is cut into main modules. Each module is assessed in a most appropriate individual way e.g. via modeling calculations. The single results are joint together according to the reliability of the subsystems. Separating criteria for the system were proposed through a reliability formula developed during a series of European-American workshops on NDE reliability. Examples of all three approaches will be given. T2 - 4th International Workshop - Advances in Signal Processing for Nondestructive Evaluation of Materials CY - Québec, Canada DA - 2001-08-07 KW - Reliability of NDE Systems KW - Performance Demonstration KW - Essential Parameters KW - European Standards KW - Radiographic Testing KW - Film Digitalization KW - Austenitic Tube Welds KW - ROC KW - POD PY - 2002 UR - http://intl.gel.ulaval.ca/image_site/abs_quebec_01.pdf SN - 1-571-17091-X N1 - Geburtsname von Rosenthal, Martina: Scharmach, M. - Birth name of Rosenthal, Martina: Scharmach, M. N1 - Geburtsname von Jaenisch, Gerd-Rüdiger: Tillack, G.-R. - Birth name of Jaenisch, Gerd-Rüdiger: Tillack, G.-R. N1 - Serientitel: Topics on nondestructive evaluation series – Series title: Topics on nondestructive evaluation series IS - 6 SP - 61 EP - 72 PB - American Society for Nondestructive Testing CY - Columbus, Ohio AN - OPUS4-2007 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ewert, Uwe A1 - Beckmann, Jörg A1 - Bellon, Carsten A1 - Jaenisch, Gerd-Rüdiger A1 - Zscherpel, Uwe A1 - Jechow, Mirko T1 - Fehlergrößenabhängige Kontrastreduktion und zusätzliche Unschärfe durch Streustrahlung - Film und digitale Detektoren im Vergleich N2 - Die radiografische Bildqualität in ihrer klassischen Definition hängt von Kontrast, Rauschen und Unschärfe ab. Diese Parameter werden normalerweise mit Bildgüteprüfkörpern (BPK) bestimmt. Die Streustrahlung reduziert im Allgemeinen immer die Bildqualität in der Radiografie. Verschiedene Einflussgrößen werden unter Berücksichtigung von Techniken, wie Film-Radiografie, Computer-Radiografie mit Speicherfolien und digitale Radiographie mit Matrixdetektoren, analysiert. In Lehrbüchern und Standards werden das Streuverhältnis k und verschiedene Kontraste definiert. Für digitale Medien werden zusätzliche Parameter wie das Signal-Rausch-Verhältnis SNR und das Kontrast-Rausch-Verhältnis CNR eingeführt. In diesem Zusammenhang wird der Einfluss der Streustrahlung aus dem Messobjekt und dem Detektor bestehend aus Kassette bzw. Gehäuse und sensitiver Detektorschicht auf die Bildqualität ermittelt. Die numerische Modellierung wird eingesetzt, um die Streustrahlung und die Primärstrahlung aus dem Objekt separat zu bestimmen. Die Streustrahlung aus dem Objekt und Detektor erzeugen eine Abbildung des Objektes, die dem Primärstrahlungsbild überlagert ist, wobei das Streubild eine höhere Unschärfe aufweist. Dieser Effekt hängt von der Fehlergröße, dem Abstand zwischen Detektor und Objekt und der Zwischenfilterung ab. KW - Digitale Radiologie KW - Kontrast-Rausch-Verhältnis KW - Streuverhältnis KW - Röntgen Simulation PY - 2008 SN - 0025-5300 VL - 50 IS - 10 SP - 560 EP - 568 PB - Hanser CY - München AN - OPUS4-18346 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -